[Bug 712643] qtdemux: couple of issues with vobsub

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712643
  GStreamer | gst-plugins-good | git

Jan Schmidt <thaytan> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.3.1

--- Comment #4 from Jan Schmidt <thaytan at noraisin.net> 2013-11-20 15:40:51 UTC ---
Fixed, in qtdemux and dvdspu:

commit 81e2c8130a7a2a9316cd79d3f84d97979c7010b6
Author: Jan Schmidt <jan at centricular.com>
Date:   Thu Nov 21 02:28:27 2013 +1100

    isomp4: Handle mp4s subpicture streams better.

    Clean up the handling of mp4s streams. Use the generic esds
    descriptor function to extract the palette, instead of hard coding
    a wrong magic offset.

    Add some more size safety checks when parsing ES descriptors, and
    replace magic numbers with the descriptive constants that are already
    defined.

    Enhance dump output for stsd atoms.

    Streams from both bug 712643 and historic bug 568278 now both work
    correctly.

    Fixes: #712643

commit c336f7642cd83a4521a91198e6c9ccee05c84f1d
Author: Jan Schmidt <jan at centricular.com>
Date:   Wed Nov 20 12:46:23 2013 +1100

    dvdspu: Handle vobsub packets smaller than 4 bytes

    In particular, handle the case of an empty packet with size 0 bytes.

    Partially fixes: #712643

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